Sheet-metal pulley



June 15 ,1926.

L58291 H. G. CARLSON SHEET METAL PULLEY Filed Dec l, 1924 n) LLL AW YMpressing operations willbe Patented June 15, 1926.r

UNITED' STATES PATENT OFFICE.

HJALMAR G. CARLSON, F WORCESTER, JBIASSACHUSETTS, ASSIGNOR TOROCK'i/VOGD SPRINKLER COMPANY OF :MASSACHUSETTS OF WORCESTER,`MASSACI-IUSETTS,

A CORPORATION OF MASSACHUSETTS.

SHEET-METAL PULLEY.

Application filed December rlhis invention relates to a pulley formedentirely of sheet metal, particularly a flanged pulley.

The principal objects ofthe invention are to provide a construction iiiwhich the metal few and simple in which the parts will fit together andby which they can easily be secured so as to form a very rigid anddurable pulley at a very low expense. l

Reference is to be had to the accompanying drawings, iii which l Fig. lis a side view of one of the parts of which the pulley is made;

is a face View of the same;

"u 3 is a side View of the other part;

el is a face view of the saine; and Fig. 5 is a central sectional Viewthrough the completed pulley, showing the parts assembled.

Several attempts have been made to form pulleys of sheet metal but theyhave nece"- sitated complicated and numerous metal pressing operationswith a correspondingly expensive installation of machinery. For thepurpose of obviating this difficulty I form my pulley in two parte, Aand B. The part A is formed from a circular blank and provided with asimple flat face, which, it will be seen later, constitutes not only theend of the pulley but one of the flanges. One side of this flange isprovided, by a simple well known metal pressing operation, with anintegral cylindrical central projection l0 to constitute a hub. This isall there is to this part of the device except that some perforationsare made equally distant from the center for receiving the fasteningrivets if they are to be used.

The other part, B, is formed by metal pressing operations so as toprovide it with an annular wall l2 l'iaving perforations correspondingwith the perforations in part A, if desired. This annular wall has acentral perforation lll for fitting the projection l() which constitutesthe hub of the pulley. This part B also is provided with a cylindrical,or preferably crowned, face or periphery 13, which, of course, isintegral with the wall 12 and is provided on its free edge with anopposite fiat flange l5 having the saine diameter as the diameter of thepart A.

hese two parte are set together with the hub l2 extending through theperforation 14 1, 1924. Serial No. 753,072.

and fitting therein and the flat inner face of the part A abuttingagainst the flat rear face of the wall il. The holes, if the article ismade that way, are brought into registration and rivets 16 insertedandheaded over. If it is desired, these holes and rivets can be avoided byspot welding the parts together. The projection and perforationconstitute n'icans for centering the two parts in assembling.

It will be seen that the projection l() constitutes a hub. The flat wallof the part A and the wall l2 together constitute.' an end of doublethickness for supporting the rest of the pulley. The face of the pulleycan be nade fiat or crowned as may be desired and it has two flangespreferably of the saine diameter and thickness at'opposite ends of theface of the pulley.

Thus the constitution of my pulley obviously involves comparatively fewmetal pressing operations and hence few machines and dies for itsmanufacture. Each part of the pulley can be produced from a flat blankkwith very few operations. It is strong and well balanced.

Although I have illustrated and described only a single form of theinvention l am aware of the fact that modifications can be Vmade thereinby any person skilled in the art without departing from the scopeof theinvention as expressed in the claims. T herefore l do not wish to belimited to all the details of construction herein shown and describedbut what I do claim is:-

l. As an article of manufacture, a pulley comprising two members, onemember having a cylindrical portieri, one edge of said cylindricalportion being turned outwardly and forming a flange, and the other edgeturned inwardly, forming an inwardly eX- tending flange, the othermember being a circular plate with the central portion thereof pressedinwardly and forming the hub of the pulley, said hub portion fittingsnugly in the opening formed by said inwardly extending flange, saidinwardly extending flange and the circular plate being permal nentlysecured together, and the circular plate beingI of a diameter suflicientto form the other flange of the completed pulley.

As an article of manufacture, a flanged pulley consisting of two parte,each formed of pressed metal, one part consisting of a fiat circulerplate with a perforation therethrough, the Walls of Said perforationbeing pressed inwardly to form u cylindrical portion constituting thehuh of the pulley, the other ineinher ceneietii'ig of un annuler fiatplate haring; e central hole fitting and receiving seid huh and having ecircular portion egi'tending' around its circumference and constitutingthe periphery of the pulley end provided at the end thereof With acircular flange projecting 'beyond the face of' the pulley, the firstnained plate projectingbeyond the periphery of the pulley to constitutethe second flange.

3. AS an article of' manufacture, a pulley comprising` e het circularpressed metal plate With a central perforation there through, the Wellsof said. perforation being preesed inwardly to forni a cylindricalportion to constitute the huh of the pulley, and another pressed metal,member consisting` of an annule-r flat plate havinge central holefitting Said huh and centering. ity for receiving it and hay/'ing acylindrical portion e2;- rei'idiiig` around its circumference and constifuting the periphery of the pulley and prox/ideal et the end thereofwith e flat circuler flange projecting leyond the fece of the pulley,the first named plateprojecting beyond the peril'ahery of the pulley toconstitute the second flange.A

ln testimony whereof I have vhereunto affixed iny signature.

HJALMAR G. CARLSQNJ

